According to the degree of harm and protection required to deal with pathogenic microorganisms, biosafety laboratories are usually divided into four levels in the world, with the lowest level of protection and the highest level of protection.

Laboratory biosafety levels can be divided into basic laboratory-level I biosafety level, basic laboratory-level II biosafety level, protective laboratory-level III biosafety level and highest protective laboratory-level IV biosafety level.

P means protection and protection in English, and P4 is the highest level of biosafety defense.

In the highest-level biosafety laboratory, besides other general protective measures, there are positive pressure protective clothing, sealed doors, chemical showers, sewage treatment systems, air filtration systems and so on. Avoid the threat of harmful biological factors through protective barriers and management measures.

Extended data:

As a big country, China has a vast territory, and infectious diseases such as SARS may break out at any time. In order to study this urgent and deadly virus, there must be a P4 laboratory. It is not only the highest-level biosafety laboratory in China, but also will promote cooperation among countries along the Belt and Road to prevent and control sudden infectious diseases.

201101October 3 1, Wuhan National Biosafety Laboratory of Chinese Academy of Sciences (Wuhan P4 Laboratory) was built in Wuhan, which indicates that China has formally possessed the hardware conditions for the research and utilization of virulent pathogens. This is also the first P4 laboratory put into operation in Chinese mainland.

References:

Baidu Encyclopedia-Biosafety Level

Baidu encyclopedia-biosafety level 4 laboratory

Baidu Baike-Wuhan P4 Laboratory

China Youth Daily-The first P4 laboratory in China was built.

China established the first P4 laboratory to study dangerous viruses.

China News Network-China establishes the first P4 laboratory in Asia.